The Marker Band Sorter, which was a collaborative senior design project from San Diego State University that began in January 2020 until December 2020. I worked in a team with 3 other mechanical engineering students, where I was the Software Lead.
My contributions to this project include:
- Collaborated with sponsors from Johnson Matthey company and facilitated communication with project team members
- Modified pre-existing CAD models in SolidWorks to implement them with our SolidWorks assembly
- Analyzed stresses for each critical part and subsystem for our project
- Developed C/C++ code for serial communication between servo motors, stepper motor drivers, stepper motors, an Arduino, and a machine vision camera
- Click here to see code
- Designed and integrated the electrical circuitry of the Marker Band Sorter
- Develop system level diagram of Marker Band Sorter
Check out the project website for more info!
The manufacturer, Johnson Matthey, is currently doing quality control of marker bands (small radiopaque metal bands) via manual inspection under a microscope. This process is tedious and time consuming, thus a streamlined and automated sorting method is desired.
This system must be able to sort out colored marker bands from large batches of approximately 5,000+ pieces. It must be able to sort bands that fall below the following dimensions:
- Outer Diameter Range: 0.070” – 0.170”
- Wall Thickness Range: 0.0018” – 0.003”
- Length Range: 0.020” – 0.125”
The system must also be able to pause for 600ms under the camera.
- Machine must be tabletop size
- Sort oversized marker bands if possible
- Must be made out of medical grade material
- Clearances in the machine must be large or small enough so marker bands do not get caught
- Modular to sort a given batch of marker band sizes
- The system must sort 125,000 parts per day. This is equivalent to approximately 1.44 marker bands per second.
An automated, machine vision sorter that sorts marker bands based on color, utilizing a Pixy2 Camera. This sorter is designed to be interchangeable with a Keyence XT-24 3D scanning camera, capable of measuring band length tolerance. In addition, this sorter will allow a bulk amount of marker bands to be automatically sorted into separate containers.